A free Wolfram Alpha Google add-on for Firefox lets you run a side-by-side comparison of results from Google, and the new Wolfram Alpha search engine. Google matches run down the left side of your browser as always, while Wolfram Alpha results are displayed on the right, where text ads would otherwise appear.

Mozilla's Firefox 3.5 Release Candidate 2 is now out in the open, and the web browser's release could accelerate the decline of Microsoft Internet Explorer as the dominant choice for computer users worldwide.